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    <title>Title</title>
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    <h1>首页</h1>
    <a th:href="@{/download/chapter04.zip}">下载chapter04.zip</a><br/>
    <a th:href="@{/download/27A99F9A335C4106BD8B2E8B8C1EB288.jpg}">下载图片[直接访问，会直接打开]</a><br/>
    <a th:href="@{/loaddown/for/picture}">下载图片[经过 handler 方法]</a>

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